Lester s



(No Model.)

L. S. ELLSWORT'H.

LUCK.

No. 447,871. Patented Mer.. 10,1891.

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s UNITED STATES PATENT EEICE.

LESTER S. ELLSVVORTH, OF I-IOLDREGE, NEBRASKA.

LOCK.

SPECIFICATION forming part of Letters Patent No. 447,871, dated March10, 1891.

' Application filed June 12,1890. Serial No. 355,159. (No model.)

To @ZZ whom it may concern:

Be it known that I, LESTER S. ELLsWoRTH, of I-Ioldrege, in the county ofPhelps and State of Nebraska, have invented certain new and usefulImprovements in Door-Locks; and I do hereby declare that the followingisa full, clear, and exact description ot' the invention, which willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form part otI thisspecification.

This invention relates to certain improvements in door-locks.

The object of the invention is to provide an improved lock which, whenlocked from the inside, cannot be unlocked by a key inserted from theoutside, thereby rendering it impossible for the lock to be picked orotherwise opened from the outside when locked from within. These objectsare accomplished by, and this invention consists in, certain novelfeatures of construction and in combinations of parts more fullydescribed hereinafter, and particularly pointed out in the claim.

Referring to the accompanying drawings, Figures 1 and 2 are elevations,respectively, of 'opposite sides of the lock, with the sides of thecasing removed. Fig. 3 is a horizontal section taken through the casejust above the bolt.

In the drawings, the reference-letter d indicates the casing or box ofthe lock, constructed in any suitable manner.

b is the sliding bolt of the lock provided with spring c, pressing downon the upper edge of the same to hold the bolt in position when slidingback and forth.

The case is provided with separate and distinct key-holes CZ c,respectively, through-the outer and inner sides of the ease, so that thebolt can be operated from the inside or outside. The key-holes are outof alignment and in dierent planes, as clearly shown. The edge of thebolt directly above the key-holes is provided with the notches orrecesses d e', one for each key-hole, to receive the tongue of a key fwhen inserted in the key-hole and turned or partially rotated therein,it being evident from the drawings that when a key is inserted in eitherone of the holes and turned its tongue will swing up and enter one ofsaid recesses, and as the key continues to turn the tongue thereof willthrow the bolt in or out according to its position and the direction ot'rotation of the key.

The construction as so far described could be locked or unlocked at anytime by a key inserted in either key-hole; but in order to prevent thisthe inner portion of the bolt is recessed or reduced on opposite sidesto receive the two vertically-swinging catches cl2 e2, each catch beingpivoted at its rear end to allow its smaller or'tapered frontendVertical swing, and this small end is beveled at the lower edge of itsfront extremity and provided with a shoulder g, and each catch normallyextends across its respective notch in the boltedge, as clearly shown.

Each side of the casing is provided with a pin h, projecting inwardly,and preferably formed integral therewith. Each pin h is so arranged inrespect to the catch on that side of the bolt that when the key isinserted in either key-hole and turned to lock the bolt the tongue willswing into the notch in the bolt for that key-hole, will engage andraise the catch extending across said notch and will throw the boltforward, and when the bolt reaches its locked position and the key isremoved the raised catch drops onto the pin 71. on that side ot' thecase, the pin entering the shoulder of the catch, and thereby lockingthe bolt in position unless the particular catch is raised. l-Ience if aperson ina house had thus operated the lock from the 'inside it would beimpossible to unlock it bya key inserted through the outside key-hole,as the catch holding the bolt locked is on the inside totallyindependent of the outside catch, and the bolt can only be thrown backby a key inserted on the side which raises the Acatch from the bolt andthen withdraws the bolt.

The catch which is not raised when the bolt is operated slides beneathits pin.

Of course this .lock is adapted for any use.

It is evident that various slight changes might be made in the form andarrangements of the parts described without departing from the spiritand scope of my invention.`

What I claim is- In a lock, the combination of the casing, the

IOO

solid bolt, the opposite sides of the rear end the easing, all arrangedand operating; subof the bolt being recessed, key-holes inoppostantially its described.

site sides of said ensingoutot' alignment with In testimony that I claimthe foregoing as eaeh other, notches in the lower edge of the my own Iaffix my signature in presence of 5 bolt opposite each key-hole, the twogravitytwo witnesses.

catches pivoted in said recesses on opposite f1 A ,r f o sides of thebolt and extending across said LEMER b' ELLS OR FH' notches and havingthe beveled sind shonl- Witnesses: dered ends, stops to limit theirdownward II. E. PECK,

1o swing, and the pin for each eateh formed on C. M. XVERLE.

